Win 2k Guest crashes every few days - VB guest console shows -Abort-

My Win2k guest system started crashing with VB 3.2.2. This happens every 4 to 5 days. I've looked in the log and I see nothing that would indicate the system is having problems. My host system is Ubuntu 9.10. I recently switched my host system from Windows to Ubuntu. This may have started then... it's just that as soon as I switch to my Ubuntu host I also upgraded to 3.2.2.

Please let me know if there are logs that I should be watching or if I can send you any additional information

The CORE dump documentation references dump files "core.<pid>". I have no such files present even though my Win2k VM aborts every few days. The documentation refers to "Virtualbox Crash"... when my Virtual Machine crashes, Virtualbox continues to run and my other VM's (linux) are not disturbed.